1、 INCH-POUNDMIL-DTL-28731F January 22, 2007 SUPERSEDING MIL-DTL-28731E 11 October 2000 DETAIL SPECIFICATION CONNECTORS, ELECTRICAL, RECTANGULAR, REMOVABLE CONTACT, FORMED BLADE, FORK TYPE (FOR RACK AND PANEL AND OTHER APPLICATIONS) GENERAL SPECIFICATION FOR This specification is approved for use by a
2、ll Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers rectangular, electrical connectors with removable formed blade; fork type contacts intended for use in electronic and electrical equipment (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 General. The docum
3、ents listed in this section are specified in sections 3, 4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this
4、list, document users are cautioned that they must meet all specified requirements documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications standards, and handbooks. The following specifications, standards, and handbo
5、oks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract (see 6.2). Comments, suggestions, or questions on this document should be addressed to: Commander, Defense Supply Center Columbus
6、, Attn: VAI, P.O. Box 3990, Columbus, Ohio, 43218-3990 or emailed to RectangularConnectordscc.dla.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. AMSC N/A FSC 5935 Provided by IH
7、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-28731F 2DEPARTMENT OF DEFENSE MIL-F-14072 - Finishes for Ground Based Electronic Equipment MIL-C-22520/17 - Crimping Tools, Terminal, Hand, Wire Termination for Crimp Type Removable Contacts, Electric Connect
8、ors MIL-M-24519 - Molding plastics, Electrical, Thermoplastic MIL-C-28731/20 - Connector, Electrical, Contact, Fork Type, Crimp Removable (8.5 Amperes) MIL-C-28731/35 - Connector, Electrical, Contact, Fork Type, Crimp Removable (5.0 Amperes) MIL-I-81969/4 - Installing and Removal Tools, Connector El
9、ectrical Contact, (Fork Type Wrappost/Crimp, Removable Contacts), Electrical Connectors, Type II, Class I, Composition C MIL-I-81969/5 - Installing and Removal Tools, Connector Electrical Contact, (Fork Type Crimp, Removable), Type I, Class 1, Composition A MIL-I-81969/11 - Installing and Removal To
10、ols, Connector Electrical Contacts, (Type CR), Type II, Class 1, Composition C MIL-I-81969/13 - Installing and Removal Tools, Connector Electrical Contact, (Type CR), Type I, Class 1, Composition A (See ASSIST database for list of specification sheets). DEPARTMENT OF DEFENSE STANDARDS MIL-STD-202 -
11、Tests Methods for Electronic and Electrical Component Parts MIL-STD-889 - Dissimilar Metals MIL-STD-1285 - Marking of Electrical and Electronic Parts (Copies of these documents are available online at http:/assist.daps.dla.mil/quicksearch/ or http:/assist.daps.dla.mil or from the Standardization Doc
12、ument Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2 Other Government documents, drawing, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, th
13、e issues are those cited in the solicitation. The following documents form a part of this specification to the extent specified herein. ASTM INTERNATIONAL ASTM A342/A342M - Materials, Feebly Magnetic, Permeability of ASTM A484/A484M - General Requirements for Stainless and Heat-Resisting Wrought Ste
14、el Products (Except Wire) ASTM A582/A582M - Free-Machining Stainless and Heat-Resisting Steel Bars, Hot Rolled or Cold Finished ASTM B85 - Standard Specification for Aluminum Alloy Die Castings ASTM B139/B139M - Standard Specification for Phosphor Bronze Rod, Bar, and Shapes. ASTM B488 - Standard Sp
15、ecification of Gold for Engineering Uses ASTM D5948 - Standard Specification for Molding Compounds, Thermosetting (Copies of these documents are available online at http:/www.astm.org or from the ASTM International, P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) Provided by
16、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-28731F 3ELECTRONIC INDUSTRIES ALLIANCE (EIA) EIA-364 - Electrical Connector/Socket Test Procedures Including Environmental Classifications EIA-364-06 - Contact Resistance Test Procedure for Electrical Conn
17、ectors EIA-364-08 - Crimp Tensile Strength Test Procedure for Electrical Connectors EIA-364-13 - Mating and Unmating Forces Test Procedure for Electrical Connectors EIA-364-20 - Withstanding Voltage Test Procedures for Electrical Connectors, Sockets and Coaxial Contacts EIA-364-21 - Insulation Resis
18、tance Test Procedure for Electrical Connectors, Sockets, and Coaxial Contacts EIA-364-23 - Low Level Contact Resistance Test Procedure for Electrical Connectors and Sockets EIA-364-26 - Salt Spray Test Procedure for Electrical Connectors, Contacts and Sockets EIA-364-27 - Mechanical Shock (Specified
19、 Pulse) Test Procedure for Electrical Connectors EIA-364-28 - Vibration Test Procedure for Electrical Connectors and Sockets EIA-364-29 - Contact Retention Test Procedure for Electrical Connectors EIA-364-31 - Humidity Test Procedure for Electrical Connectors and Sockets EIA-364-32 - Thermal Shock (
20、Temperature Cycling) Test Procedure for Connectors and Sockets (Copies of these documents are available online at http:/www.eia.org or from the Electronic Industries Alliance, Technology Strategy bosses, guide pins, guide sockets, or jackscrews (see 3.1). 3.4.4 Mating. Unless otherwise specified, co
21、nnector plugs and receptacles shall be capable of being mated and unmated by hand without the aid of special tools, within the temperature range (see 3.1). 3.4.5 Mounting accessories. Guide pins, guide sockets, shields, and other hardware shall be as specified (see 3.1). 3.4.6 Actuating hardware des
22、ign. To aid in the engagement of connectors, actuating hardware shall be used as required. This hardware shall be categorized as follows and be denoted by their associated type. 3.4.6.1 Type C jackscrew. Rotatable actuating member with a male thread (engages with a type F fixed socket). The actuatin
23、g knob includes a screwdriver slot. 3.4.6.2 Type D jacksocket. Rotatable actuating member with a female thread (engages with a type E fixed screw). 3.4.6.3 Type E fixed screw. Fixed actuating member with a male thread (engages with a type D or H jacksocket). Provided by IHSNot for ResaleNo reproduct
24、ion or networking permitted without license from IHS-,-,-MIL-DTL-28731F 83.4.6.4 Type F fixed socket. Fixed actuating member with a female thread (engages with a type C or G jackscrew). 3.4.6.5 Type G jackscrew. Rotatable actuating member with a male thread (engages with a type F fixed socket). Actu
25、ating knob is for hand tightening only. 3.4.6.6 Type H jacksocket. Rotatable actuating member with a female thread (engages with type E fixed screw). Actuating knob includes a screwdriver slot. 3.5 Interchangeability. All contacts shall be capable of being assembled in the molded insulators (see 3.1
26、) and be completely interchangeable with each other with respect to installation (physical) and performance (function) as specified herein. All complete connectors including their complement of contacts, having the same Part or Identifying Number (PIN) shall be completely interchangeable with each o
27、ther with respect to installation (physical) and performance (function) as specified herein. Tools shall be capable of properly inserting and removing the contacts from the molded inserts. Evidence, such as dimensional data, may be required by the Government in order to assure that contacts, complet
28、e connector assemblies, and tools, will be interchangeable and meet the requirements of this specification. 3.5.1 Plugs and receptacles. Plugs and receptacles of a given size and design, manufactured by one source to the requirements of this specification, shall be capable of mating with associated
29、plugs and receptacles manufactured to the requirements of this specification by other sources. The connector assemblies having the same PIN shall be directly and completely interchangeable with respect to installation and performance. 3.5.2 Loose crimp contacts. Removable contacts are to be included
30、 with the connector. For connectors supplied with loose crimp contacts, the quantity of crimp contacts to be supplied with each connector shall consist of a full complement of contacts plus one spare contact for connectors using 26 contacts of each size used shall be supplied. 3.6 Performance. Conne
31、ctors shall be designed to meet the requirements specified herein. 3.6.1 Insulation resistance. When tested as specified in 4.7.2, the resistance shall be not less than 5,000 megohms, except after humidity exposure the resistance shall be not less than 1,000 megohms. 3.6.2 Temperature cycling. When
32、tested as specified in 4.7.3, the connectors shall not show evidence of physical damage. 3.6.3 Dielectric withstanding voltage. When tested as specified in 4.7.4, the connectors shall withstand 1,500 volts without flashover. 3.6.4 Contact retention. When tested as specified in 4.7.5, individual cont
33、acts shall withstand an axial load of 10 pounds (4.54 kilograms) without damage to the contact, insert or contact retaining clip. 3.6.5 Vibration. When the complete connector assembly, wired with the appropriate size wire, is tested as specified in 4.7.6 (10G, 10 to 500 Hz), there shall be no cracki
34、ng, breaking, or loosening of parts. There shall be no loss of electrical continuity with any of the contact circuits for more than 1 microsecond with 100 milliamperes flowing in each circuit. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-2
35、8731F 93.6.6 Mechanical shock. When tested as specified in 4.7.7, there shall be no evidence of failure of metallic or dielectric materials, nor shall the mated portions of the connector become disengaged. For connectors exposed to the high impact shock test, there shall be no loss of electrical con
36、tinuity for more than 20 milliseconds to any of the contact circuits, or 1 microsecond for connectors tested for compliance to the specified pulse shock test. 3.6.7 Mating and unmating forces (connector assembly). When tested as specified in 4.7.8, the force and torque required to either engage or s
37、eparate any pair of mated connectors (plug and receptacle) shall not exceed the maximum force and torque specified (see 3.1). 3.6.8 Humidity. When tested as specified in 4.7.9, the connectors shall meet the following requirements: a. Insulation resistance - Shall not be less than 1,000 megohms. b. D
38、ielectric withstanding voltage - 50 percent of specified voltage (see 3.8). 3.6.9 Durability. When tested as specified in 4.7.10, the connector assembly shall withstand the test without evidence of electrical or mechanical damage that impairs the normal operation of the connector. 3.6.10 Salt spray
39、(corrosion). When tested as specified in 4.7.11, there shall not be sufficient corrosion on the connectors to interfere with mating or unmating, or cause exposure of base metal on contact sets when inspected at less than 10 power magnification. Following the test, the contacts only shall meet the fo
40、llowing requirement: a. Low level circuits - Shall not exceed the potential drop values specified in 3.6.15. 3.6.10.1 Contacts supplied in reels. When contacts are separated from the carrier strip, base metal may be exposed. Following the salt spray test, any corrosion that may occur in the region o
41、f the separation, shall not interfere with the ability of the contacts to meet the subsequent test requirements, either for contacts tested separately, or as part of the connector, including the ability to mate or unmate the connectors. 3.6.11 Contact resistance. When tested as specified in 4.7.12,
42、the contact resistance of each mated pair of contacts shall not exceed the potential drop requirements in table l. TABLE l. Contact resistance. Wire size AWG Test current (amperes) Maximum potential drop (mV) Contact resistance (maximum) (m) 18 20 22 24 26 28 30 8.5 7.5 5.0 3.0 2.0 1.5 1.0 51.0 45.0
43、 40.0 26.0 24.0 22.0 20.0 6.0 6.0 8.0 8.7 12.0 14.7 20.0 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-28731F 103.6.12 Crimp tensile strength (crimp contact) (when specified, see 3.1). When tested as specified in 4.7.13, the contact to wire
44、 crimp shall not break or pull out at less than the minimum tensile strength specified in table ll. TABLE ll. Crimp tensile strength. Wire size AWG (7 or 19 strand)Minimum tensile strength (pounds) 18 20 22 24 26 28 30 40.0 25.0 15.0 10.0 5.0 3.0 1.5 3.6.13 Crimp tensile strength (adapter to crimp c
45、ontact). When tested as specified in 4.7.13.1, the adapter to contact crimp shall not break or pull out at less than the minimum tensile strength specified (see 3.1). 3.6.14 Contact separating forces (contacts). When contacts are tested as specified in 4.7.14, unless otherwise specified (see 3.1), t
46、he forces required to disengage the contacts shall be 12 ounces per contact. 3.6.15 Low level circuit resistance (contacts). When tested as specified in 4.7.15, the values of contact resistance shall not exceed the potential drop in table lll. 3.6.16 Resistance to soldering heat. Connectors shall wi
47、thstand the tests specified in 4.7.16. TABLE lll. Low level circuit. Wire size AWG Contact resistance (maximum) 1/ (m) Maximum potential drop (V) 18 20 22 24 26 28 30 7 9 15 20 25 40 50 7.0 9.0 15.0 20.0 25.0 40.0 50.0 1/ Test current shall be 1mA. Provided by IHSNot for ResaleNo reproduction or net
48、working permitted without license from IHS-,-,-MIL-DTL-28731F 113.7 Marking. 3.7.1 Connectors. Each connector shall be legibly and permanently marked, die cast, or stamped in accordance with MIL-STD-1285. The marking shall be placed on a side of the connector parallel to the long dimension. Wherever
49、 possible, the marking information shall be located such that it is not obscured by the subsequent addition of a connector shield. 3.7.2 Contact positions. Letters shall be arranged to avoid confusion between contacts. All letters or numerals shall appear on the front and rear face of each insert. Lettering of the plug insert shall correspond with that of the mating receptacle insert. 3.8 Workmanship. The workma
